Logic Masters Deutschland e.V.

Sudoku Variants Series (333) - Odd or Even Sandwich Sudoku

(Eingestellt am 11. August 2021, 00:00 Uhr von Richard)

Für dieses Sudoku-Varianten-Projekt habe ich geplant, jede Woche eine andere Sudokuvariante zu veröffentlichen. Ich werde sehen wie lange es dauert bis mir die Ideen ausgehen.

Odd or Even Sandwich Sudoku
Verwende die üblichen Sudoku-Regeln.
Wenn die erste Ziffer in einer Zeile oder Spalte ungerade ist, dann geben die Hinweise außerhalb des Gitters alle Ziffern dieser Zeile oder Spalte an, die ungerade Nachbarn auf beiden Seiten haben. Wenn die erste Ziffer gerade ist, dann geben die Hinweise alle Ziffern an, die gerade Nachbarn auf beiden Seiten haben. Die Hinweise sind aufsteigend sortiert. Ein Strich bedeutet, dass es keine Ziffern gibt, die diese Bedingung erfüllen.

Dieses Rätsel ist von Hu Mengting inspiriert.

Solve online in Penpa+ (thx again to Henry!)

Lösungscode: Zeile 2, gefolgt von Spalte 9.

Zuletzt geändert am 11. August 2021, 05:30 Uhr

Gelöst von Greg, Bobby, cdwg2000, henrypijames, Statistica, Jesper, zuzanina, marcmees, Senior, rcg, ibag, Mody, kublai, Seb_, Uhu, HaSe, bigger, SudokuExplorer, azalozni, geronimo92, Zzzyxas, KlausRG, ... Droi, ildiko, ffricke, Kwaka, sandmoppe, Nick Smirnov, cornuto, sojaboon, NikolaZ, snowyegret, Frankenfruity, Angelo, Nylimb, Piatato, zorant, Krokant, AMD, Carolin, TomBradyLambeth, Nickyo
Komplette Liste


am 7. November 2022, 23:28 Uhr von Nylimb
I really enjoyed the logic in this one. Thanks!

am 30. September 2021, 11:28 Uhr von Hausigel_mod
Parity tag added

am 23. August 2021, 19:27 Uhr von pin7guin
Ich mag Paritäten! :-)

am 11. August 2021, 22:43 Uhr von SudokuExplorer
Very enjoyable parity variant! The break-in was well-telegraphed and after the next key step, it went very smoothly, thanks! :-)

am 11. August 2021, 17:47 Uhr von Mody
Mal wieder klasse :)

am 11. August 2021, 17:41 Uhr von ibag
Sehr schön und flüssig zu lösen. ;-)

am 11. August 2021, 14:07 Uhr von marcmees
Very nice. I must admit that I struggled a bit with the "-" at the start and now I finished SVS333 I can't say why. Very straightforward solve once I got my head wrapped around the rules. thanks again.

am 11. August 2021, 10:35 Uhr von zuzanina
Sehr schön, vielen Dank!

am 11. August 2021, 05:32 Uhr von Richard
@Henry: the entry in this puzzle is not that hard once you understand the way the instructions work. By the looks of it you had some problems with that. I will write the first few steps of the logical solve in a hidden comment.

am 11. August 2021, 05:30 Uhr von Richard
Added to the instructions that the clues outside the grid are written in ascending order.

am 11. August 2021, 05:22 Uhr von Richard
Added link to online solving. Once more a big thank you to Henry!

am 11. August 2021, 04:08 Uhr von henrypijames
Very, very slow going to get started. But once broken in, it was smooth sailing. Did you take my comment from last week to heart and decided to switch things up, @Richard? ;)

am 11. August 2021, 04:06 Uhr von henrypijames
My suggestion: Clues outside a row/column give all digits in that row/column, each of which is individually sandwiched within that row/column between immediate neighbors with the same odd/even parity as the first (top/left most) digit of that row/column. Digits in the clues may appear in any order within the corresponding row/column. A dash clue indicate no digit is sandwiched in the aforementioned manner.

This phrasing is still anything but easy to understand, but at least much more precise. A visual example (like the one from the referenced puzzle) is mandatory for this ruleset, I think.

Zuletzt geändert am 11. August 2021, 02:32 Uhr

am 11. August 2021, 02:30 Uhr von cdwg2000

If the first cell is an odd number O, the external prompts are X, Y and Z, and the corresponding methods are OXO, OYO, OZO; the first cell is an even number E, and the external prompt is ABC, and the corresponding methods are EAE, EBE , ECE; The order of XYZ and ABC is not restricted; if the external prompt is -, the first cell is odd O/E, there must be no O? O format or E? E format.

If you have a better description, please let me know, thanks!

Zuletzt geändert am 11. August 2021, 02:25 Uhr

am 11. August 2021, 02:18 Uhr von henrypijames
The wording of the rules is ambiguous in two aspects: 1. How does "both sides" apply to first/last row/column? Just one side or toroidal? 2. Does "corresponding row/column" mean same row/column or the row/column indicated by the first digit or the given digit?

EDIT: I misunderstood even more than I thought! I thought a clue for R3 refer to digits and their neighbors in R2 and R4, not in R3 itself. The wording from the referenced puzzle is better but still not good - only the given example made things clear.

Penpa+: https://git.io/JRK8G

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